_______ is known to all，China will be an _______ powerful country in 20 or 30 years’ time.
A、That；advancingC
as可以用来引导一个非限制性定语从句，通常无明显的先行词。as指代的是主句陈述的内容。而as引导的从句既可以放于句首，也可以放于句末或句中。
There are many sales this season, during which stores will lower their _______ prices.
We thank you for your letter of May 5th, ____ your purchase from us of 5000 tons Green Beans.
By the middle of the 21st century, the vast majority of the world ’s population will be living in cities _______ in the country.
Jack managed to get 147 tapes and 100 books plus lots of magazines through customs in a(n> _____ way
We ____ some brochures ____ to illustrate the types of materials we manufacture.
